Mechanical warp stop motion



W. H. WAKEFIELD Dec. 30, I930.

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Fild Nov. 2, 1928 MECHANICAL WARP STOP MOTION M bf WAKEFIELD Patented Dec. 30, 1930 PATENT OFF ICE;

WALTER H. WAKEFIELD, or WORCESTER, MASSACHUSETTS, ASSIGNOR 'rocnoMrron axnownns LOOM'WORKS, or woncns'rnn, mnssacnnsn'rrs, a oonrona'rxou or MASSACHUSETTS MECHANICAL WARP STOP MOTION 7 Application filedNoveniber 2, 1928. Serial No. 316,835.

This invention relates to improvements in mechanical warp stopmotions and 1t 1s the general object of the invention to provide a motion wherein the knocking-011 of a shipper handle and the operation ofa detecting part p of the mechanism maybe actuated bya sine gle lever acting in conyu'nction witha yieldable element upported by the lever and tending to give the detecting elements their regular movements.

The invention relates more particularly to the type of motion shown in Reissue Pateut No; 14,829to Regan and Patent No.

1,360,638 to Holmes. Mechanisms-of this type have ordinarily been provided with a knockofi mechanism of the type shown in the Regan" patent, but in that motion there is a pivoted dog which is mounted on a movable member, the dog being held in inoperative position through theaction of a light spring.-

It is an important object of my present invention to simplify the type of motion shown." patent and eliminate the in the Holmes spring.

It is a further object of my present invention to provide a cam lever which shall have pivotally mounted onone end thereof a weighted element and a regularly moving actuator member which is given a risingand falling motion preferably on everyalternate beat of the loom, themechanism-being soorganized that the weighted element is eiiec tive' to move the actuator member-tofim,

operative'position when there is no fault in the warp. r

It is afurther object of my presentinvem,

tion to provide a knock-off mechanism wherein there is employed a knock-off lever symmetrical about a plane perpendicular to its axis so that the same may be used either. to create tension in a pull rod tofefie'ct knock- 03 or to push. the rod forwardlyto stop the loom, depending upon which. position vthe. knock-off lever occupies.

With these andother objects in view which a convenient embodiment of my invention is set forth,

- Fig. 1 is a vertical transverse section taken through a loom having my improved warp stopmotion applied thereto, the parts being shownin running and non-detecting position in full l nes and in knocking-0E position in dotted lines,

F 2 is aside elevation of thewarp stop motion on an enlarged scale showing the parts in non-detecting position in full lines,

rection of arrow 3, Fig. 2, and

Fig. 4 is a topplan View or" the actuator lever taken in the direction of arrow .4,

Fig.1. 1 1

Referring particularly to ,Fig. 1,1 have Fig. 3 is a side elevation takenin the dishown a loom JI'rame 1O as being provided.

with the usual bottom shaft 11 which is given a complete revolution every second pick of the loom by mechanismznot shown. The shipper handle 12 ismounted on the shipper shaft 13 and operates throughamech amsm not shown to keep the 100m in opera- I tionwhen in the forward full; line position,

but acts to stop the doom when in the rear dotted line position shownin Fig. 1.

r1suitablysupported rod 14 hassecured theretothe dependingvhub l5 ofa head frame lS-throughwhich extends a plurality,

of horizontally aligned bushings 17. Each bushing 1s free to rotate'in'thehead 16 and has secured thereto a linklS which prevents movement of the bushings through the plate 16 to: the right, as viewed in Fig. 3. Each bushing is fitted to a non-circular detector drop wires vD and is operatively related to its bushing to be oscillated about'its axis during the normal running ofthe loom. The

lowerends oi the links are pivoted to a connector 20, the eiiect of the connector 20 being tocause all of the rods 19 to oscillate in unison. The matter thus far described may be substantially the same as that shown in the rod 19which extends through slots in the aforesaid patents and forms no part of my present invention.

In carrying my improvements int-o'efi ect provide the head16with an upwardly proecting horn 30 from which projects laterally a stud 31 on which is pivotally mounted a knock-off lever 32. The latter has a vertically extending arm 33 to the extremity of which is pivoted a rod 34. The latter by means of a coupling 35 is connected to a second rod 36 which extends loosely through a portion 37 of the shipper handle 12. A collar 38 is secured in adjusted longitudinal position along the rod 36 and is positioned for engagement with the portion 37.

The horizontally extending arm 39 of the lev r is so placed as to be directly over a vertically reciprocating actuating member 40 and when engaged by the latter will cause rocking of lever in a right hand directioi'i asviewed in Fig. l to move the shipper handle from the full to the dotted line position. Said actuator rod or member is adjustably secured at its lower end to a weighted element 41 movable freely about a stud mounted on a cam lever 43. The latter is supported by a stud 44 held in fixed position by a bracket 45 mounted on the loom frame 10. A second bracket 46 has adjustably secured therein: a stop screw 47 located under a weighted proj ection 48 ofthe weighted member 41 extending to the left of stud 42.

The right hand end of the cam lever 43 is provided with a roll 49 which cooperates with a cam 59 having a roll depressing face 51. The cam is secured to the bottom shaft 11 and as set forth herein will cause an oscillation of the cam lever 43 every other pick of the loom.

The upper end of the actuator member 40 extends through a horizontal projection 52 which is formed as a part of the left hand link 18 as viewed in Fig. 2. This extension is integral with the lower part of the corresponding link and when moved angularly will cause rocking movement of the detector rods 19. The upper end of the actuator is free to move through a perforation '53 formed in the projection 52 as shown in Fig. 3.

In operation, the bottom shaft 11 will ro- 'tate constantly to cause a periodic elevation every other pick of the loom of the-stud 42 on the cam lever. Prior to the beginning of the raising of stud 42 the weighted end 48 will rest on the screw 47, but as the stud 42 rises there will be a tendency on the part of the weighted member 41 to move in a counter-clockwise direction. around stud 42 with the weighted end 48 supported by the screw 47. Such an action will tend to move the upper end of the actuator rod 40 to the left as viewed in Fig. 1 and as said member 49 passes through the projection 52 the latter will tend to impartangular movement as previously described to the detector rods 19. If all the drop wires D are raised the tendency of rods 19 and 40 to move will not be resisted, the upper end of the actuator rod being'movable to the left to assume the dotted line position shown in Fig. 2 when there is no fault in the warp so that a continued upward movement of said member 40 will carry the latter to one side of the horizontal lever 39 of the knock-off lever. Under these conditions, therefore, the knock-off rod 34 will re main at rest and the shipper handle will there fore remain in running position.

When a fault occurs in the warp, however, a drop wire D will fall to arrest angular movement of its detector rod 19. The upper narrow end 70 of slot 71 in the drop wires D, one of which is shown in Fig. 2, acts to prevent oscillation of the rods 19 when the drop wires are down, as set forth in the aforesaid patents.

As the cam continues to rotate the stud 42 will be moved to its lowest position due tov the weight of the member 40 which serves to hold the roll 49 against the .cam and under these conditions the actuator member 40 will be moved to the right or restored to the full line position shown in Figs..1 and 2. This position as shown clearly in Fig. 2 corresponds to the vertical position of the detector rods 19 so that the latter can be engaged by the restricted slot in the drop wire should any one of the latter be in lower position.

\Vhen'there is warp fault one of the drop wires will be down and the corresponding rod 19 will be held against oscillation so that as stud 42 rises the member 40 will not be permitted to move tothe left. 'The weight 48 will move upwardly away from the supporting screw 7 and the member 40 will move longitudinally with no appreciable angular motion and as the cam 50 continues. to rotate the upper end of the member 40 will engage the horizontal arm 39 of the knock-off lever and rock the latter to the dotted line position shown in Fig. 2. This action on the part of the knock-off lever will stop the loom by throwing the shipper handle 12 from the full to the dotted line position shown in Fig. 1 as previously described.

'By referring to Fig. 3 it will be seen that the knock-otflever 32is symmetrical about a plane passing through the arms 33 and 39 perpendicular to the stud 31 and lying intermediate the forks 60 of said arm 33.. A stop pin 61 may project from the horn 30 to engage the arm 39. and limit angular movement to the left of the knock-off rod 34, movement of said rod 34 to the right being limited by collar 38 and extending portion 37 of the shipper handle, as shownin Fig. 1.

It will also be seen that the stud 31 is located high enough above the links 18 to permit inversion of the lever 33 if desired so that the arm 33 will tend to occupy the dot and dash position shown in Fig. 2. WVhen in this position the rods 34 and 36 will be placed under tension so as to create a pull where the shipping mechanism is such as to require this type of motion. It is to be understood of course that my invention is not limited to the particular form of shipper handle set forth herein and that the motionon the part of the arm 33'either to the right or to the left may be employed to effect stopping ot'the loom.

F romthe foregoing it will be seen that I have provided a warp stop motion wherein a single cam and lever act topermit a weighted member to cause rocking of the detector rods and also stopping of the loom at the time of warp fault. It will further be seen that the adjusting screw 47 may be varied to change- I the location of the upperend of the member 40. It will also be seen that the knock-oh" lever is so designed that the same may be reversed on its stud so as to transmit either a compressing or a tensioning force to the knock-off rods. V

Having thus described Vmy invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do notwish to be limited to the details herein disclosed, but what I claim is: f

1. In a warp stop motion, a detector rod to be oscillated about the axis thereof, a 100m stopping mechanism, a regularly moving driving means havlng a PGIlOCllC movement,

a weighted actuator pivotally mounted on,

the means and having operative connection with the detector rod, said actuator member moving toward the stopping device when the means has a periodic movement and tending by its weight to move to one side of the stop-' I ping device and tooscillate the detector rod,

the detector rod when held against movement causing engagement of the stopping device by the actuator member.

2. In a warp stop motion, a detector rod to be oscillated about the axis thereof,'a loom stopping mechanism, a regularly .moving driving means having a periodic movement, a

weighted actuator member pivotally mounted on; the means and movable with the lat.- ter, a support for the weighted member to hold the latter in alignmentwith the stopping device when the-means is in one position,

mechanism establishing anoperative connection between the actuator member and the detector rod, said 'weighted member when the tee means moves to the other position tending through said mechanism to oscillate the detecting rod and'remain in contact with the support to move the member out of alignment with the stopping device, and said member moving away from the support when the means moves to the said one positlon and the detector rod is held against movement to cause engagement of the stopping device by the actuator member.

3. In a warp stop motion, a; detector rod non-circular in cross section to be oscillated about its axis, astopping device to be moved at the time of warp' fault to stop the loom,

a regularly moving lever having regular workingand non-working strokes during the operation of the loom, a weighted actuator the actuator member to hold the same in member pivoted to the lever,ia-"support for:

normal position in alignment with the-stoptector rod and move said member out of alignment with the stopping device, and said actuator member moving with and being lifted from the support therefor into engagement withthe stopping device when the detector rod isheld against oscillation.

In a warp stop motion, a detector rod non-circular in cross section to be oscillated about its axis, a stopping device to be moved at the time of warp fault to stop the loom, .alevernhaving regular working and non-working strokes during'the operation of the loom, aweighted element pivotally mounted on the lever and extending substantially horizontally, a support for said element, an actuator rod extending upwardly from the element and normally in alignment with-the stopping def,

vice when the lever is beginning its working, stroke, means establishing an operative connection between a rod secured to the weightedelement and the detector rod whereby movement of the actuator rod out of alignment with the stopping device will cause oscillation of the detector rod, said weighted element acting when the lever moves on its work ing stroke to move'the actuator rod out of alignment with the stopping device when the detector, rod is free to rotate, and said means between the rods causing the, weighted element to be moved away from the support as the lever moves on its working stroke and effect engagement between the actuator rod and the stopping devicewhenthe detector rod is held against rotary movement.v

5. In a.' warp stop motion, a detector rod non-circular in cross section to be oscillated I about its axis, a stopping device to be moved at the time of warp fault to stop the loom, a

' regularly moving lever having regular working and non-working strokes during the operation of the loom, a link moving withthe detector rod and having a guide opening "therein, a weighted element pivotally mountedon the lever and having a portion to extend through the guide opening, a support for the weighted element independent of the lever,

said support vholding the weighted actuator 7 element in such a position when the lever is beginning its working stroke as to be in aligninent' with the stoppingdevice and to move the detecting rod to a detectin position, and said weighted actuator mem er when the lever moves on its working stroke tending to remain in contact with the independent sup- 5 port therefor to cause movement of the link and oscillation of the detector rod and also to move the actuator member out of alignment with the stopping device, said detector red when held against oscillation acting through the link to hold the actuator member in alignment with the stopping device and move the weighted element away from the independent support therefor when the lever moves on its working stroke. In testimony whereof I have hereunto a tfixed my signature.

WALTER H. WAKEFIELD. 

